Projector device and method for controlling the same

ABSTRACT

The disclosure relates to a projector device and a method for controlling the same. A master projector device according to an embodiment may obtain first sensing information through a visible light sensor, obtain second sensing information through an invisible light sensor, generate a positional relationship with a slave projector device based on the first sensing information and the second sensing information, and control a positional relationship of the slave projector device based on the generated positional relationship and a coordinate value of an invisible indicator identified by the invisible light sensor while projecting an image stored in a memory to a projection surface.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/KR2023/001292 designating the United States, filed on Jan. 27, 2023,in the Korean Intellectual Property Receiving Office, which claimspriority from Korean Patent Application Nos. 10-2022-0064961, filed onMay 26, 2022, and 10-2022-0097993, filed on Aug. 5, 2022, in the KoreanIntellectual Property Office, the disclosures of all of which areincorporated by reference herein in their entireties.

BACKGROUND Field

The disclosure relates to a projector device and a method forcontrolling the same.

Description of Related Art

A display device is a device for outputting images and may display imagedata through a display panel. The display device cannot output an imagein a size outside its designed dimension range, and furthermore, isdifficult to implement to have a large screen.

As another image output device, a projector device is used. Theprojector device projects an image to a projection surface (e.g.,screen), displaying the image emitted from a light source on the screen.The projector device may output images in a wider range in a distancefarther from the projection screen. However, as the distance increases,the resolution and the brightness or contrast ratio (CR) maydeteriorate—namely, display quality may decrease. Thus, it is common toplace and use the projector device in an appropriate position.

In a case where two or more projector devices project an image inconjunction with each other, if a positional relationship of any one ofthe two projector devices changed, a distorted image may be output.

SUMMARY

Embodiments of the disclosure provide a projector device that reduces adifference in brightness between an overlapping area and anon-overlapping area of two projection areas when projecting an image inconjunction with another projector device.

Embodiments of the disclosure provide a projector device that may detectdistortion output and restore it to the original positionalrelationship.

According to an example embodiment, a master projector device comprises:a visible light sensor configured to detect a visible light wavelengthband, an invisible light sensor configured to detect an invisible lightwavelength band, at least one transceiver configured to communicate witha slave projector device, a memory including a program including atleast one instruction, and at least one processor electrically connectedwith the visible light sensor, the invisible light sensor, the at leastone transceiver, and the memory and configured to execute the at leastone instruction of the program. In an embodiment, the processor may beconfigured to: obtain first sensing information obtained through thevisible light sensor. In an embodiment, the processor may obtain secondsensing information through the invisible light sensor. In anembodiment, the processor may generate a positional relationship with aslave projector device based on the first sensing information and thesecond sensing information. In an embodiment, the processor may controla projection direction and projection range of the slave projectordevice based on the generated positional relationship and the secondsensing information (e.g., the coordinate value of an invisibleindicator identified while projecting the image after generating thepositional relationship) identified by the invisible light sensor whileprojecting an image stored in the memory to a projection surface.

In an example embodiment, the master projector device may include aprojector and an emitter. In an embodiment, the projector may beconfigured to project an image in a visible light band onto the firstprojection area. In an embodiment, the emitter may be configured to emitan invisible indicator of the invisible light band to be included in thefirst projection area.

In an example embodiment, the positional relationship may include ahomography matrix. In an example embodiment, the processor may beconfigured to: project a visible indicator onto the first projectionarea using the projector. In an embodiment, the processor may controlthe slave projector device to project a visible indicator onto thesecond projection area.

In an example embodiment, the processor may be configured to: generate arelationship matrix related to the first and second projection areas. Inan embodiment, the processor may generate the homography matrix byassociating the coordinate value of the invisible indicator identifiedby the invisible light sensor in the second projection area with therelationship matrix.

In an example embodiment, the processor may be configured to: project avisible indicator onto the first projection area using the projector. Inan embodiment, the processor may control the slave projector device toproject a visible indicator onto the second projection area. In anembodiment, the processor may generate first relationship informationbased on positions of visible indicators identified by the visible lightsensor in the first projection area and the second projection area. Inan embodiment, the processor may generate second relationshipinformation by associating a position of the invisible indicatoridentified by the invisible light sensor to the first relationshipinformation in at least one of the first projection area or the secondprojection area. In an embodiment, the second relationship informationmay be configured of at least a portion of the location relationship. Inan embodiment, the relationship information is information associatedwith the positional relationship, and may include, e.g., a homographymatrix, but is not limited thereto. In an embodiment, relationshipinformation may be used interchangeably with the term “locationrelationship”.

In an example embodiment, a field of view of the projector may be set tobe smaller than the field of view of the visible light sensor.

In an example embodiment, the field of view of the projector may be setto be smaller than the field of view of the invisible light sensor.

In an example embodiment, the emitter may be configured to emit light ina wavelength band of at least one of ultraviolet, near ultraviolet,infrared, and near infrared light.

In an example embodiment, the first sensing information may include acoordinate value regarding a plurality of visible indicators projectedby the projector.

In an example embodiment, the second sensing information may include acoordinate value regarding a plurality of invisible indicators projectedby the emitter.

In an example embodiment, the processor may be configured to identify anoverlap area included in the first projection area using the visiblelight sensor. In an example embodiment, grayscale in the overlap areamay be changed in gradations.

In an example embodiment, the processor may be configured to: identifyan overlap area included in the first projection area using the visiblelight sensor. In an embodiment, the processor may change the grayscaleof a filling area including the overlapping area into a specifiedgrayscale value. In an embodiment, the processor may change the graylevels in at least two areas adjacent to the overlap area in gradationsoutward.

According to an example embodiment, a master projector device comprises:a projector configured to output a visible indicator and an image, anemitter configured to emit an invisible indicator, a visible lightsensor configured to identify the visible indicator, an invisible lightsensor configured to identify the invisible indicator, at least onetransceiver configured to communicate with a slave projector device, amemory including a program including at least one instruction, and atleast one processor electrically connected with the projector, theemitter, the visible light sensor, the invisible light sensor, the atleast one transceiver, and the memory and executing the at least oneinstruction of the program. In an example embodiment, the processor maybe configured to: identify the invisible indicator emitted to at least apartial area of a projection surface corresponding to a second field ofview through the invisible light sensor having the second field of viewwhile projecting an image stored in the memory to the projector having afirst field of view. In an example embodiment, the processor may beconfigured to control a projection direction and projection range of theslave projector device based on a coordinate value of the identifiedinvisible indicators.

In an example embodiment, the field of view of the projector may be setto be smaller than the field of view of the visible light sensor.

In an example embodiment, the field of view of the projector may be setto be smaller than the field of view of the invisible light sensor.

In an example embodiment, the processor may be configured to compare thecoordinate value of the identified invisible indicators with a specifiedhomography matrix. In an example embodiment, the processor may beconfigured to control the projection direction and projection range ofthe slave projector device so that the coordinate value of theidentified invisible indicators has a difference less than a specifiedthreshold from the homography matrix.

In an example embodiment, the processor may be configured to project avisible indicator onto the first projection area using the projector. Inan embodiment, the processor may control the slave projector device toproject a visible indicator onto the second projection area. In anembodiment, the processor may generate first relationship informationbased on positions of visible indicators identified by the visible lightsensor in the first projection area and the second projection area. Inan embodiment, the processor may generate second relationshipinformation by associating a position of the invisible indicatoridentified by the invisible light sensor to the first relationshipinformation in at least one of the first projection area or the secondprojection area. In an embodiment, the second relationship informationmay be configured of at least a portion of the location relationship.

In an example embodiment, the processor may be configured to control theprojector to output only the invisible indicator, of the visibleindicator and the invisible indicator, while outputting the image.

Without limitations thereto, a method for controlling an electronicdevice (e.g., a master projector device or a user equipment (UE))according to an example embodiment comprises: obtaining first sensinginformation through the visible light sensor, obtaining second sensinginformation through the invisible light sensor, generating a positionalrelationship with a slave projector device based on the first sensinginformation and the second sensing information, and controlling theprojection direction and projection range of the slave projector devicebased on the generated positional relationship and the coordinate valueof an invisible indicator identified by the invisible light sensor whileprojecting an image stored in the memory to a projection surface.

Without limitations thereto, a method for controlling an electronicdevice (e.g., a master projector device or a user equipment (UE))according to an example embodiment comprises: emitting the invisibleindicator onto the first projection area while projecting an imagestored in the memory to a specified first projection area andcontrolling the projection direction and projection range of the slaveprojector device based on the coordinate value of the identifiedinvisible indicators on the first projection area.

A non-transitory computer-readable recording medium (CRM) according toan example embodiment may have recorded thereon one or more instructionswhich, when executed by at least one processor included in an electronicdevice (e.g., a master projector device, a slave projector device, or aUE) or another electronic device coupled with the electronic device,cause the electronic device to perform operations of the above-describedelectronic device and operations of the control method.

When the projector device according to various example embodiments ofthe disclosure projects an image in conjunction with another projectordevice, the area in which two projection areas by the respectiveprojector devices overlap is rendered to have grayscale changes ingradations, reducing the difference in brightness between theoverlapping area and the non-overlapping area.

Further, the projector device according to various example embodimentsmay detect a change in the positional relationship with thecorresponding projector device or another interworking projector devicethrough various sensors or cameras and gradually restore to the originalpositional relationship based on a pre-stored positional relationship.

Effects of the disclosure are not limited to the foregoing, and otherunmentioned effects would be apparent to one of ordinary skill in theart from the following description. In other words, unintended effectsin practicing embodiments of the disclosure may also be derived by oneof ordinary skill in the art from the embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of certainembodiments of the present disclosure will be more apparent from thefollowing detailed description, taken in conjunction with theaccompanying drawings, in which:

FIG. 1 is a block diagram illustrating an example configuration of aprojector device according to various embodiments;

FIG. 2 is a block diagram illustrating an example configuration of aprojector device according to various embodiments;

FIGS. 3A and 3B are diagrams illustrating an example configuration of aprojector system according to various embodiments;

FIG. 4 is a diagram illustrating a projection area and an overlap areaaccording to various embodiments;

FIG. 5 is a diagram illustrating a displayable area according to variousembodiments;

FIGS. 6, 7, 8, 9, and 10 are diagram illustrating a content display areaaccording to various embodiments;

FIGS. 11, 12, 13, 14, 15 and 16 are diagrams illustrating edge blendingin an overlap area according to various embodiments; and

FIGS. 17, 18, 19, 20, and 21 are diagrams illustrating correction of aprojection direction and a projection range using an invisible indicatoraccording to various embodiments.

Reference may be made to the accompanying drawings in the followingdescription, and specific examples that may be practiced are shown asexamples within the drawings. Other examples may be utilized andstructural changes may be made without departing from the scope of thevarious examples.

DETAILED DESCRIPTION

Various example embodiments of the disclosure are now described ingreater detail with reference to the accompanying drawings. However, thepresent disclosure may be implemented in other various forms and is notlimited to the various example embodiments set forth herein. The same orsimilar reference denotations may be used to refer to the same orsimilar elements throughout the disclosure and the drawings. Further,for clarity and brevity, description of well-known functions andconfigurations in the drawings and relevant descriptions may not bemade.

FIG. 1 is a block diagram illustrating an example configuration of aprojector device according to various embodiments.

In an embodiment, an electronic device may be implemented in the form ofa projector device (e.g., a master projector device MPJ or a slaveprojector device SPJ). In an embodiment, the master projector device MPJand the slave projector device SPJ may implement a multi-projectorsystem. The multi-projector system may adjust display performance, suchas brightness, screen size, and screen magnification, by means of aplurality of projector devices.

In an embodiment, a display system includes a master projector deviceMPJ and a slave projector device SPJ. In an embodiment, the masterprojector device MPJ and the slave projector device SPJ may beelectrically or communicatively connected. The master projector deviceMPJ may control the operation of the slave projector device SPJ throughan electrical connection or a communication connection. In anembodiment, the master projector device MPJ and the slave projectordevice SPJ may have the same or different configurations. Each device isdescribed below.

Referring back to FIG. 1 , in an embodiment, the master projector deviceMPJ includes one or more processors (e.g., including processingcircuitry) 110, one or more memories 120, and one or more transceivers(e.g., including communication circuitry) 130. In an embodiment, themaster projector device MPJ may include at least one of one or moreprojectors (e.g., included in a projector unit) 140, one or moreemitters (e.g., included in an emitter unit) 150, one or more visiblelight sensors (e.g., included in a visible light sensor unit) 160, andone or more invisible light sensors (e.g., included in an invisiblelight sensor unit) 170, as additional components.

In an embodiment, the master projector device MPJ may include aprojector 140. In an embodiment, the projector 140 may include one ormore projectors. In an embodiment, the projector 140 may include aprojector and a projector circuitry for driving the projector. In anembodiment, the projector circuitry may be electrically connected with aprocessing circuitry. In an embodiment, the projector 140 may beconfigured to project an image in a visible light wavelength band.

In an embodiment, the emitter 150 may include one or more emitters. Inan embodiment, the emitter 150 may include the emitter and an emittercircuitry for driving the emitter. In an embodiment, the emittercircuitry may be electrically connected to the processing circuitry. Inan embodiment, the emitter 250 may be configured to project an image ofan invisible light wavelength band. The invisible light wavelength bandmay include, but is not limited to, e.g., ultraviolet, near-ultraviolet,infrared, or near-infrared wavelength bands.

In an embodiment, the wavelength bands projected by the projector 140and the emitter 150 may be configured not to overlap each other.

In an embodiment, the projector 140 and the emitter 150 maysimultaneously or sequentially project light. For example, during afirst frame, the projector 140 may project visible light and, during asecond frame at least partially not temporally overlapping the firstframe, the emitter 150 may project invisible light. For example, duringthe same frame, the projector 140 and the emitter 150, respectively, mayproject visible light and invisible light. The first frame and thesecond frame may be temporally divided.

In an embodiment, the visible light sensor 160 may include an imagesensor. The visible light sensor 160 may detect light in a visible lightwavelength band. In an embodiment, the field of view (FOV) of thevisible light sensor 160 may be set to be larger than the field of viewof the projector.

In an embodiment, one or more invisible light sensors 170 may include,but are not limited to, an infrared sensor, an IR sensor, and/or anultraviolet sensor. The invisible light sensor 170 may detect light inan invisible light wavelength band other than the visible lightwavelength band. In an embodiment, the field of view of the invisiblelight sensor may be set to be larger than the field of view of theprojector. In an embodiment, the field of view of the invisible lightsensor may be set to be the same as or similar to the field of view ofthe visible light sensor, but is not limited thereto. In the followingdisclosure, a case in which the fields of view of the visible lightsensor 160 and the invisible light sensor 170 are identical isillustrated by way of non-limiting example and described, but variousembodiments of the disclosure are not limited thereto.

In an embodiment, the slave projector device SPJ includes one or moreprocessors 110, one or more memories 120, and one or more transceivers130. In an embodiment, the master projector device MPJ may include atleast one of one or more projectors 140, one or more visible lightsensors 160, and one or more invisible light sensors 170, as additionalcomponents. In an embodiment, the slave projector device SPJ may beelectrically connected with the master projector device MPJ. In anembodiment, the slave projector device SPJ may be communicativelyconnected to the master projector device MPJ through a wirelessinterface. In an embodiment, the slave projector device SPJ may receivea control signal from the master projector device MPJ and may performone or more operations based on the received control signal. In anembodiment, the slave projector device SPJ may be controlled by themaster projector device MPJ. Without limitations thereto, for example,the master projector device MPJ may generate one or more commands forcontrolling a control method according to various example embodiments ofthe disclosure, which are described in greater detail below withreference to FIGS. 5 to 21 , or transmit the commands to the slaveprojector device SPJ. For example, the slave projector device SPJ mayperform a passive operation, such as outputting an image or performingsynchronization based on commands received from the master projectordevice MPJ.

In an embodiment, the slave projector device SPJ may perform one or moreoperations based on a control signal or control command received fromthe master projector device MPJ and may transmit feedback in response tocompleting one or more operations. In an embodiment, the feedback may betransmitted to the master projector device MPJ for all or some of thecontrol commands.

In an embodiment, the slave projector device SPJ may receiveinformation, data or signals from the master projector device MPJ. In anembodiment, the slave projector device SPJ may operate based on theinformation, data or signals received from the master projector deviceMPJ. The information, data, or signals transmitted/received between theslave projector device SPJ and the master projector device MPJ accordingto an embodiment of the disclosure are described in greater detail belowwith reference to FIG. 3 .

Referring back to FIG. 1 , in an embodiment, the slave projector deviceSPJ may include the same or different components as/from the masterprojector device (MPJ).

In an embodiment, the slave projector device SPJ may have the same orsimilar configuration as the master projector device MPJ. In this case,any one of the plurality of projector devices may be set as the masterprojector device MPJ, and the rest may be set as slave projector devicesSPJ. In an embodiment, the master projector device MPJ may be set basedon user settings, but is not limited thereto. The user settings may bemade based on, e.g., the user input received through an input module(e.g., mouse, keyboard, touchscreen, etc.), but is not limited thereto.

In an embodiment, the slave projector device SPJ may have a differentconfiguration from the master projector device MPJ. In this case, theslave projector device SPJ may not include at least some of thecomponent(s) of the master projector device MPJ. In an embodiment, theslave projector device SPJ may not include at least one of the visiblelight sensor 160 and the invisible light sensor 170. As such, themanufacturing cost of the slave projector device SPJ may be reduced byexcluding some components.

FIG. 2 is a block diagram illustrating an example configuration of aprojector system according to various embodiments.

Referring to FIG. 2 , according to an embodiment, a projector systemincludes a master projector device MPJ and a slave projector device SPJcoupled with the master projector device MPJ. The master projectordevice MPJ and the slave projector device SPJ may transmit and receiveelectrical signals through a wired or wireless interface.

In an embodiment, the master projector device MPJ may include acontroller (e.g., including processing and/or control circuitry) 210. Inan embodiment, controller 210 may be understood as including theprocessor 110 of FIG. 1 . In an embodiment, the controller 210 mayinclude a first processor and a second processor functionally distinctfrom the first processor. The first processor and the second processormay be electrically connected or implemented as an integrated processor.In an embodiment, the first processor may identify a pattern or analyzean image based on a visible indicator or an invisible indicator.Further, the first processor may electrically control electricallyconnected system components. In an embodiment, the second processor mayperform warping, keystone, and edge blending. Further, the secondprocessor may electrically control electrically connected systemcomponents.

In an embodiment, the controller 210 may be electrically connected withat least one of an invisible light sensor unit (e.g., including at leastone invisible light sensor) 252, a visible light sensor unit (e.g.,including at least one visible light sensor) 251, an emitter unit (e.g.,including an emitter) 241, a projector unit (e.g., including aprojector) 242, a transceiver (e.g., including communication circuitry)230, an image buffer unit (e.g., including an image buffer) 220, animage distribution unit (e.g., including image distribution circuitry)270, an image input unit (e.g., including image input circuitry) 260, avideo encoder 281, and a video decoder 282.

In an embodiment, system components electrically connected to thecontroller 210 (e.g., the invisible light sensor unit 252, the visiblelight sensor unit 251, the emitter unit 241, the projector unit 242, thetransceiver 230, the video buffer unit 220, the video distribution unit270, the video input device 260, the video encoder 281, and the videodecoder 282) may be operated according to control commands of thecontroller 210. In an embodiment, the operation of the individual systemcomponents may be understood as performed by the controller 210 or bythe processing circuitries of the individual system components.

In an embodiment, the master projector device MPJ may include an imagebuffer unit 220. In an embodiment, the image buffer unit 220 may storesynchronization timing information. In an embodiment, the image bufferunit 220 may store image data provided from the image distribution unit270. In an embodiment, the image data stored in the image buffer unit220 may be synchronized based on synchronization timing information. Inan embodiment, the synchronized image data may be provided to thecontroller 210.

In an embodiment, the master projector device MPJ may include atransceiver 230. In an embodiment, the transceiver 230 may includevarious communication circuitry and transmit image data to the slaveprojector device SPJ. In an embodiment, the transceiver 230 may receivevideo data encoded by the video encoder 281 before transmitting thevideo data and transmit the encoded video data to the slave projectordevice SPJ.

In an embodiment, the transceiver 230 may transmit correctioninformation for location correction. In an embodiment, the correctioninformation may include at least one of synchronization timinginformation for image synchronization between projectors, image locationinformation indicating the location where the image is to be projected,warping information for determining a projection range, or edge blendinginformation for adjusting the brightness of the overlapping projectionareas. In an embodiment, the correction information may be generated bythe controller 210.

In an embodiment, the transceiver 230 may receive image data forprojection. In an embodiment, the transceiver 230 may receive encodedvideo data. The encoded video data is provided to video decoder 282. Theimage data decoded by the video decoder 282 is provided to the imagedistribution unit 270.

In an embodiment, the master projector device MPJ may include an emitterunit 241 and/or a projector unit 242. In an embodiment, the masterprojector device MPJ may include an invisible light sensor unit 252and/or a visible light sensor unit 251. In an embodiment, thedescription of the emitter unit 241, the projector unit 242, the emitterunit 241 and the projector unit 242 is the same as that of the emitterunit 150 and the projector unit 140 of FIG. 1 , and no duplicatedescription is given below.

In an embodiment, the master projector device MPJ may include an imageinput device 260. The image input device 260 may be configured toreceive image data according to, e.g., a high definition multimediainterface (HDMI) standard or a digital video interface (DVI) standard,but is not limited thereto.

In an embodiment, the master projector device MPJ may include an imagedistribution unit 270. In an embodiment, the image distribution unit 270may provide the image data obtained through the video decoder 282 or theimage input unit 260 to the video encoder 281 or the image buffer unit220. In an embodiment, the image distribution unit 270 may provide atleast part of the obtained entire image data to the image buffer unit220 and provide the remaining part to the video encoder 281.

In an embodiment, the master projector device MPJ may include a videoencoder 281 and a video decoder 282. The video encoder 281 may beconfigured to encode the video data before transmitting the video datato the slave projector device SPJ. The video decoder 282 may beconfigured to decode the encoded video data received from otherelectronic devices (e.g., server devices, STBs, user equipment (UE), orother projector devices).

FIGS. 3A and 3B are diagrams illustrating an example projector systemincluding an external device according to various embodiments.

Referring to FIGS. 3A and 3B, in an embodiment, the projector system mayinclude a master projector device MPJ, a slave projector device SPJ, andan external device EXD.

In the case of the projector system shown in FIG. 3A, the slaveprojector device SPJ may be controlled by the master projector deviceMPJ. The external device EXD (e.g., a UE or a computing device) may bewiredly or wirelessly coupled to the master projector device MPJ.

In the case of the projector system shown in FIG. 3B, the masterprojector device MPJ and the slave projector device SPJ may be wiredlyor wirelessly coupled with the external device EXD (e.g., a UE or acomputing device).

In an embodiment, at least one of the master projector device MPJ and/orthe slave projector device SPJ may be controlled based on a controlcommand received from the external device EXD. For example, the masterprojector device MPJ may operate or control the slave projector deviceSPJ based on a control command received from the external device EXD.For example, the master projector device MPJ and the slave projectordevice SPJ may operate based on a control command received from theexternal device EXD. In other words, all or at least some of the controloperations performed by the master projector device MPJ may becontrolled by the external device EXD.

FIG. 4 is a diagram illustrating an example projection area and anoverlap area according to various embodiments.

Referring to FIG. 4 , in an embodiment, the master projector device MPJand the slave projector device SPJ may project an image toward theprojection surface. When the image output by the projector device isreflected by the projection surface, an image may be represented in apredetermined projection area on the projection surface.

In an embodiment, the master projector device MPJ may project an imageto the first projection area PJA1 on the projection surface, and theslave projector device SPJ may project an image to the second projectionarea PJA2 on the projection surface. In an embodiment, the firstprojection area PJA1 and the second projection area PJA2 may at leastpartially overlap. As the first projection area PJA1 and the secondprojection area PJA2 overlap, the first projection area PJA1 and thesecond projection area PJA2 may form an overlapping area OLA, as atleast a portion. FIG. 5 is a diagram illustrating a displayable areaaccording to various embodiments.

Referring to FIG. 5 , in an embodiment, the projection areas PJA1 andPJA2 formed on the projection surface may be formed as distortedpolygons rather than rectangles. When the projector device projects animage in a direction perfectly perpendicular to the projection surface,the projection areas may be formed in rectangular shapes. However, whenthe direction in which an image is projected by the projector device isnot perpendicular to the projection surface, the projection area may beformed in various polygonal shapes other than a perfect rectangle.

In an embodiment, the projector device MPJ may identify an area wherecontent may be displayed within the projection area. In an embodiment,one or more processors of the master projector device MPJ may identify“displayable areas DAAa and DAAb” having a predetermined (e.g.,specified) size in the entire projection area PJA including the firstprojection area PJA1 and the second projection area PJA2. In anembodiment, the displayable areas DAAa and DAAb may be set to have arectangular shape, but are not limited thereto. In an embodiment, thedisplayable areas DAAa and DAAb may be set to have a preset shape and apreset ratio. The displayable areas DAAa and DAAb may be identified orformed inside the entire projection area PJA based on at least one of apreset (e.g., specified) shape and a preset ratio. For example, as shownin FIG. 5 , the displayable areas DAAa and DAAb may be identified tohave a maximum size based on two ratios. The first displayable area DAAahaving the first ratio and the second displayable area DAAb having thesecond ratio may be formed within the entire projection area PJA to forma rectangle having a maximum size in each ratio.

In an embodiment, when two or more ratio setting values are set, aplurality of displayable areas DAAa and DAAb may be identified. Whenthere are two or more ratio setting values, the projector device MPJ maycompare the areas of the rectangles based on the respective ratiosetting values. The projector device MPJ may select any one (e.g., DAAa)of a plurality of displayable areas to form a larger area.

In an embodiment, the displayable area DAA may be changed based on auser input UIN. In an embodiment, when there are a plurality ofdisplayable areas DAA, the projector device MPJ may switch from thefirst displayable area DAAa to the second displayable area DAAb based onthe user input UIN.

FIGS. 6, 7, 8, 9, and 10 are diagrams illustrating examples of a contentdisplay area according to various embodiments.

Referring to FIG. 6 , in an embodiment, at least a portion of thedisplayable area DAAa may include a content display area CDAa. Thecontent display area CDAa refers to an area that actually displaysmedia, such as images, on the projection area. In an embodiment, thecontent display area CDAa may be provided as at least a portion or atleast the entirety of the displayable area DAAa. FIG. 7 illustrates anexample in which the content display area CDAa is set as the entiredisplayable area DAAa, but is not limited thereto. For example, as shownin FIG. 9 , the content display area CDAa may be set as at least aportion of the displayable area DAAa.

Referring to FIG. 7 , in an embodiment, the displayable area DAAa may beadjusted based on the user input UIN. For example, when the user inputUIN dragging from a first point P1 to a second point P2 is received, thedisplayable area DAAa may be adjusted to have a corner at the secondpoint where the user input UIN ends. In an embodiment, the displayablearea DAAa which is adjusted based on the user input UIN may be reset andrepresented based on a preset ratio or be represented to correspond tothe second point P2 of the user input UIN regardless of the presetratio. In an embodiment, the user input UIN may be input along theboundary of the first projection area PJA1 or the second projection areaPJA2, but is not limited thereto.

Referring to FIG. 8 , the reset displayable area DAAb (seconddisplayable area DAAb) may be set to have a different ratio and/or sizefrom the first displayable area DAAa. In an embodiment, the projectordevice may project an image such that the content display area CDAb isincluded as at least a portion of the reset displayable area DAAb. In anembodiment, the content display area CDAb may maintain the ratio beforethe displayable area DAAb is reset, or may be represented with a ratioreset to correspond to the current displayable area DAAb.

Referring to FIGS. 9 and 10 , the displayable area DAA and/or contentdisplay area CDA is not limited to a rectangular shape, and in anembodiment, the displayable area DAA may be set to correspond to theentire projection area PJA. In an embodiment, the projector device MPJmay increase the dimensions of the image CDAT to be output to be largerthan the entire projection area PJA or reduce the dimensions of theentire projection area PJA to be smaller than the image CDAT to beoutput. In this case, in an embodiment, the content display area CDAcmay be formed over the entire projection area PJA. In other words, thedisplayable area DAAc and/or the content display area CDAc may have ashape corresponding to the entire projection area PJA (See FIG. 9 ).

In an embodiment, when the shapes of the content display area CDAc andthe entire projection area PJA match, the image displayed on the contentdisplay area CDAc may be limited to at least a portion of the image CDATto be output. In an embodiment, the image represented on the contentdisplay area CDAc may be represented with the first area switched to thesecond area of the entire image CDAT to be output, based on the userinput UIN.

FIGS. 11, 12, 13, 14, 15 and 16 are diagrams illustrating example edgeblending in an overlap area according to various embodiments.

Referring to FIG. 11 , in an embodiment, the projector device(s) MPJ andSPJ may represent an image in a predetermined projection area byradiating light to the projection surface. The first projector deviceMPJ (e.g., the master projector device MPJ) may display an image on thefirst projection area PJA1. The second projector device SPJ (e.g., theslave projector device SPJ) may display an image on the secondprojection area PJA2. In an embodiment, an overlap area OLA may beformed in a partial area where the first projection area PJA1 and thesecond projection area PJA2 overlap.

Since the projector device represents an image on the projection surfacein a manner of radiating light to the projection surface, it isimpossible to represent perfect black. Accordingly, in the overlap areaOLA, the projection areas PJA1 and PJA2 of two or more projector devicesoverlap, and brightness may be higher than in other areas. In anembodiment, the projector device(s) MPJ and SPJ may execute apredetermined algorithm so that a brightness difference between theoverlap area OLA and other areas is not viewed. The predeterminedalgorithm is described below with reference to FIGS. 12 to 16 .

Referring to FIG. 12 , in an embodiment, an overlap area OLA may bespecified as an area where the first and second projection areas PJA1and PJA2 overlap.

In an embodiment, the overlap area OLA may be identified by the visiblelight sensor unit of the master projector device MPJ. For example, themaster projector device MPJ may identify the overlap area OLA based onthe difference in brightness in the overlap area OLA.

In an embodiment, the overlap area OLA may be identified based onconfiguration information about the projection direction and projectionrange of the master projector device MPJ and configuration informationabout the projection direction and projection range of the slaveprojector device SPJ.

In an embodiment, the overlap area OLA may be formed to have at leastthree or at least four sides. In an embodiment, the plurality ofsurfaces of the overlap area OLA may be identified based on the type ofprojection area corresponding to each surface.

Referring to the overlap area OLA shown in FIG. 12 , two surfaces of theoverlap area OLA may overlap at least some of the boundary surfaces ofthe first projection area PJA1, and the other two surfaces of theoverlap area OLA may overlap at least some of the boundary surfaces ofthe second projection area PJA2. In an embodiment, the surface of theoverlap area OLA may be identified as a portion overlapping at leastsome of the boundary surfaces of the first projection area PJA1 and thesecond projection area PJA2. In an embodiment, a portion overlapping theboundary surfaces of the first projection area PJA1 may be defined as afirst overlap edge OLCL, and a portion overlapping the boundary surfacesof the second projection area PJA2 may be defined as a second overlapedge OLCR.

When two or more projector devices represents a bright grayscale, abrighter grayscale may be represented in an area where two or moreprojection areas overlap than other target areas. According to anembodiment, the projector device(s) MPJ and SPJ may mitigate thevisibility of such a difference in grayscale by applying a grayscalechange to the overlap area OLA corresponding to each projection area.

Referring to FIG. 13 , the overlap area OLA may include a first overlaparea OLA1 and a second overlap area OLA2. In an embodiment, the firstoverlap area OLA1 may be included in the first projection area PJA1 andmay be identified as at least a portion of the area to overlap thesecond projection area PJA2. In an embodiment, the second overlap areaOLA2 may be included in the second projection area PJA2 and may beidentified as at least a portion of the area to overlap the firstprojection area PJA1. When the first projection area PJA1 and the secondprojection area PJA2 overlap, the first overlap area OLA1 and the secondoverlap area OLA2 may overlap each other, and comprise the overlap areaOLA.

In an embodiment, the first overlap area OLA1 and the second overlaparea OLA2 may be represented with different grayscale changes.

In the first overlap area OLA1, the brightness may be represented sothat the grayscale becomes darker from left to right. In the secondoverlap area OLA2, the brightness may be represented so that thegrayscale becomes darker from right to left. In an embodiment, thedirection from left to right may be understood as a direction from thefirst projection area PJA1 to the second projection area PJA2. In anembodiment, a direction from right to left may be understood as adirection from the second projection area PJA2 to the first projectionarea PJA1. As such, as the first overlap area OLA1 and the secondoverlap area OLA2 are represented with grayscale changes complementaryto each other, the overlap area OLA may be represented with overall auniform grayscale.

When two or more projector devices represent a dark grayscale, abrighter grayscale may be represented in an area where two or moreprojection areas overlap than other target areas. According to anembodiment, the projector device(s) MPJ and SPJ may control the overlaparea OLA or a predetermined area including the overlap area OLA to berepresented in a predetermined grayscale. According to an embodiment,the projector device(s) MPJ and SPJ may apply a change in grayscale tobe naturally harmonized with the grayscales of other projection areas inthe area represented in a predetermined grayscale and an area(s) with apredetermined width, thereby mitigating the visibility of the grayscaledifference.

Referring to FIGS. 14 and 15 , the overlap area OLA may be formed in aportion where the first projection area PJA1 and the second projectionarea PJA2 overlap. In an embodiment, at least a portion of the entireprojection area PJA may be set as a filling area FA, and gradation areasGA1 and GA2 may be set on the left and right sides, respectively, of thefilling area FA, each having a predetermined width.

As shown in FIG. 14 , the filling area FA may be set with respect to avirtual line passing through the rightmost and leftmost reference pointswith respect to the projection areas PJA1 and PJA2. The virtual line maybe set to pass through the reference points in the height direction ofthe displayable area DAA. In an embodiment, the gradation areas GA1 andGA2 may be formed outward of the projection area from the virtual line.In an embodiment, the gradation areas GA1 and GA2 may be identified witha preset predetermined width.

As shown in FIG. 15 , the filling area FA may be set with respect to avirtual line passing through the rightmost and leftmost reference pointswith respect to the overlap area OLA. The virtual line may be set topass through the reference points in the height direction of thedisplayable area DAA. In an embodiment, the gradation areas GA1 and GA2may be formed outward of the projection area from the virtual line. Inan embodiment, the gradation areas GA1 and GA2 may be identified with apreset predetermined width.

Referring to FIG. 16 , in an embodiment, the filling area FA may berepresented as a preset grayscale value. In an embodiment, the gradationareas GA1 and GA2 may be represented so that the grayscale valuegradually changes from the grayscale value of the filling area FA to thegrayscale value of the projection area adjacent to the gradation areasGA1 and GA2.

FIGS. 17 and 18 are diagrams illustrating an example process of settinga positional relationship between projector devices according to variousembodiments.

Referring to FIGS. 17 and 18 , in an embodiment, one or more processorsmay project one or more indicators toward the projection surface bymeans of the projectors MPJ and SPJ. In an embodiment, the indicator mayinclude at least one of a plurality of visible indicators INVM and INVSand/or a plurality of invisible indicators INIM and INIS or may bedivided into them.

In an embodiment, the visible indicators INVM and INVS may be displayedon the projection surface by the projector unit. In an embodiment, theinvisible indicators INIM and INIS may be displayed on the projectionsurface by the emitter unit. In an embodiment, the visible indicatorsINVM and INVS and the invisible indicators INIM and INIS may bedisplayed to overlap in at least some areas, but are not limitedthereto.

In an embodiment, at least some of the visible indicators INVM and INVSmay be displayed adjacent to four corners of the projection area. In anembodiment, at least some of the invisible indicators INIM and INIS maybe displayed adjacent to four corners of the projection area.

In an embodiment, at least some of the visible indicators INVM and INVSmay be displayed vertically side by side in the center portion of theprojection area. In an embodiment, the projection area may be dividedinto at least two zones by the visible indicators INVM and INVS, but isnot limited thereto. In an embodiment, at least two zones divided by thevisible indicators INVM and INVS may be specified as areas surrounded bythe visible indicators INVM and INVS, respectively.

In an embodiment, the invisible indicators INIM and INIS may bedisplayed with a narrower vertical arrangement interval than ahorizontal arrangement interval. In an embodiment, the invisibleindicators INIM and INIS may be respectively displayed at corners of theprojection area, center points of the corners, and center points ofsurfaces of the projection area, but are not limited thereto.

In an embodiment, the projector devices MPJ and SPJ may displayinvisible indicator(s) INIM and INIS and visible indicator(s) INVM andINVS. In an embodiment, the first projector device MPJ may projectvisible indicators INVM and INVS and invisible indicators INIM and INISonto the projection surface at a different timing from that of thesecond projector device SPJ. In an embodiment, the first projectordevice MPJ may control the second projector device SPJ to project thevisible indicator(s) INVM and INVS and the invisible indicator(s) INIMand INIS onto the projection surface. For example, FIG. 18 illustratesan example in which the first projector device MPJ displays the visibleindicator(s) INVM and the invisible indicator(s) INIM on the projectionsurface. FIG. 19 illustrates an example in which the second projectordevice SPJ displays the visible indicator(s) INVS and the invisibleindicator(s) INIS on the projection surface.

In an embodiment, sensors (e.g., the visible light sensor and theinvisible light sensor) included in the projector device may have alarger field of view than the projector.

In an embodiment, the projector may project visible indicator(s) INVMand INVS in a first field of view FOVP, and the visible light sensor mayidentify the visible indicator(s) INVM and INVS in a second field ofview (e.g., FOVS). In an embodiment, the second field of view (e.g.,FOVS) may be set to be larger than the first field of view FOVP. Inother words, the visible light sensor may have a larger field of viewthan the projector. In an embodiment, as the second field of view (e.g.,FOVS) is set to be larger than the first field of view FOVP, the firstprojector device MPJ may identify at least some of the visibleindicator(s) INVS displayed on the projection surface by the secondprojector device SPJ.

In the disclosure, the field of view of the invisible light sensor maybe defined as a third field of view (e.g., FOVS). In an embodiment, theinvisible light sensor may have the same or different field of viewas/from the visible light sensor. In an embodiment, the invisible lightsensor may have a larger field of view than the projector. In anembodiment, as the third field of view (e.g., FOVS) is set to be largerthan the first field of view FOVP, the first projector device MPJ mayidentify at least some of the invisible indicator(s) INIS displayed onthe projection surface by the second projector device SPJ.

In an embodiment, the first projector device MPJ may not only identifythe visible indicator(s) INVM and the invisible indicator(s) INIM on thefirst projection area PJA1, but also identify at least some of thevisible indicator(s) INVS and invisible indicator(s) INIS on the secondprojection area PJA2.

In an embodiment, the first projector device MPJ may generate a firstrelationship matrix based on at least four visible indicators INVM. Forexample, the first projector device MPJ may compare the coordinatevalues (first coordinate value) of the visible indicators INVM stored inthe memory with the coordinate values (second coordinate value) of thevisible indicators INVM identified by the visible light sensor. In anembodiment, the first relationship matrix may be generated based on thefirst coordinate value and the second coordinate value. In anembodiment, the first relationship matrix may be stored in the memory ofthe first projector device MPJ. The first relationship matrix representsthe positional relationship between the projection surface and the firstprojector device MPJ.

In an embodiment, the first projector device MPJ may generate a secondrelationship matrix based on the visible indicators INVS identified onthe second projection area PJA2. The second relationship matrix may bestored in the memory of the first projector device MPJ. The secondrelationship matrix represents the positional relationship between theprojection surface and the second projector device SPJ.

In an embodiment, the first and second relationship matrices may beformed of homography matrices.

In an embodiment, the first projector device MPJ may generate a thirdrelationship matrix by associating the first relationship matrix withthe second relationship matrix. In an embodiment, the third relationshipmatrix may indicate a display relationship between the first projectionarea PJA1 and the second projection area PJA2.

In an embodiment, the first projector device SPJ may associatecoordinate values of the invisible indicators INIS identified throughthe invisible light sensor in the second projection area PJA2 with thethird relationship matrix. In an embodiment, the first projector deviceMPJ may create a reference positional relationship by associating thecoordinate values of the invisible indicators INIS identified in thesecond projection area PJA2 with the third relationship matrix. In anembodiment, the reference positional relationship may be defined as ahomography matrix.

In the disclosure, “reference positional relationship” may be usedinterchangeably with “final homography matrix” or “reference homographymatrix”. In the disclosure, “homography matrix” may be expressed as“reference positional relationship” depending on the context, but is notlimited thereto.

Since the emitter, projector, and sensor (e.g., visible light sensor orinvisible light sensor) of each projector device MPJ and SPJ areinstalled in fixed positions, the reference positional relationship mayalways be determined to be valid.

FIGS. 19, 20 and 21 are diagrams illustrating an example process forreidentifying the position of the second projector device usinginvisible indicators and correcting it according to various embodiments.

Referring to FIG. 19 , the projector devices MPJ and SPJ may display animage on a projection surface through a plurality of projection areas.In an embodiment, the first projector device MPJ and the secondprojector device SPJ may project an image toward the projection surfacein a first field of view FOVP. The fields of view of the first projectordevice MPJ and the second projector device SPJ are illustrated as thefirst field of view FOVP, but the fields of view of both the devices arenot limited as being the same.

In an embodiment, while projecting an image onto the projection surface,the second projector device SPJ may display the invisible indicator INISon the second projection area PJA2 by the emitter. Since the invisibleindicator INIS is not visually recognized, it does not cause anyinconvenience when the user views the image.

In an embodiment, the first projector device MPJ may identify theinvisible indicator INIS displayed on the projection surface by thesecond projector device SPJ through the invisible light sensor. In anembodiment, the first projector device MPJ may identify at least some ofthe plurality of invisible indicators INIS displayed on the secondprojection area PJA2 through the invisible light sensor having the thirdfield of view (e.g., FOVS). For reference, as described above, the thirdfield of view (e.g., FOVS) may be set to be larger than the first fieldof view FOVP.

In an embodiment, the first projector device MPJ may compare theposition of the second projection area PJA2 with the position whengenerating the homography matrix using the identified coordinate valuesof the invisible indicators INIS identified through the invisible lightsensor and the pre-created homography matrix (reference positionalrelationship).

Referring to FIG. 20 , in an embodiment, the first projector device MPJmay identify a relocation event based on the homography matrix(reference positional relationship) and the identified coordinate valuesof the invisible indicators INIS. For example, upon identifying that theinvisible indicators INIS are moved by a predetermined threshold or morebased on the homography matrix, the first projector device MPJ mayidentify that the relocation event occurs.

In an embodiment, the first projector device MPJ may control theprojection direction and projection range of the slave projector deviceSPJ based on the identified coordinate values of the invisibleindicators INIS on the second projection area PJA2. In an embodiment,the identified coordinate values of the invisible indicators INIM on thesecond projection area PJA2 may be stored in the memory. The coordinatevalues of the invisible indicators INIM stored in the memory may be usedto create the homography matrix, e.g., the reference of the positionalrelationship. The operation of controlling the projection direction andprojection range based on the coordinate values of the invisibleindicators INIS and the homography matrix is described in greater detailbelow with reference to FIGS. 20 and 21 .

FIG. 20 illustrates an example where the second projection area PJA2 ismoved in the arrow direction MOV. Referring to FIG. 20 , the firstprojector device MPJ may identify a relocation event that the secondprojection area PJA2 is moved in the arrow direction MOV based on thecoordinate values of the invisible indicators INIS and the homographymatrix (reference positional relationship).

In an embodiment, upon identifying the relocation event, the firstprojector device MPJ may control to allow the projection area of thesecond projector device SPJ to be corrected to the position whengenerating the homography matrix based on the homography matrix.Referring to FIG. 21 , the first projector device MPJ may correct thedisplay position of the second projection area PJA2 based on theidentified coordinate values of the invisible indicators INIS and thehomography matrix of FIG. 20 . For example, the first projector deviceMPJ may correct the display position to allow the second projection areaPJA2 to be moved and displayed in one direction RES.

In an embodiment, the first projector device MPJ may correct the displayposition at a preset speed (e.g., two pixels per second or 0.1 degreeper second).

The electronic device according to various embodiments of the disclosuremay be one of various types of electronic devices. The electronicdevices may include, for example, a display device, a portablecommunication device (e.g., a smartphone), a computer device, a portablemultimedia device, a portable medical device, a camera, a wearabledevice, a home appliance, or the like. According to an embodiment of thedisclosure, the electronic devices are not limited to those describedabove.

In an embodiment, the electronic device may include, but is not limitedto, one or more processors, one or more memories, and one or moretransceivers.

In an embodiment, one or more processors may include a storage andprocessing circuitry to support operation of the device. The storage andprocessing circuitry may include storage, such as non-volatile memory(e.g., flash memory, or other electrically programmable ROM configuredto form a solid state drive (SSD)) or volatile memory (e.g., static ordynamic RAM). The processing circuitry in the processor may be used tocontrol the operation of the electronic device. The processing circuitrymay be based on one or more microprocessor(s), microcontroller(s),digital signal processor(s), baseband processor(s), power managementsection(s), audio chip(s), or application specific integratedcircuitry(ies). The transceiver and memory described below are anembodiment of the processor and may be provided as functional elementsperforming specific functions or operations as at least part of theprocessor or as separate hardware components as entities performingindependent functions or operations.

In an embodiment, one or more memories may include a memory area for oneor more processors for storing variables used in the protocol,configuration, control, and other functions of the device, includingoperations corresponding to or including any one of the methods and/orprocedures described as an example in the disclosure. Further, thememory may include non-volatile memory, volatile memory, or acombination thereof. Moreover, the memory may interface with a memoryslot that enables insertion and removal of removable memory cards in oneor more formats (e.g., SD card, Memory stick, compact flash, etc.).

In an embodiment, the transceiver may include various communicationcircuitry that may be included in a wireless communication module or RFmodule. The wireless communication module may include, for example,Wi-Fi, BT, GPS or NFC. For example, the wireless communication modulemay provide a wireless communication function using a radio frequency.Additionally or alternatively, the wireless communication module mayinclude a network interface or modem for connecting the device with anetwork (e.g., Internet, LAN, WAN, telecommunication network, cellularnetwork, satellite network, POTS or 5G network). The RF module may beresponsible for data transmission/reception, e.g., transmitting andreceiving data RF signals or invoked electronic signals. As an example,the RF module may include, e.g., a power amp module (PAM), a frequencyfilter, or a low noise amplifier (LNA). The RF module may furtherinclude parts (e.g., conductors or wires) for communicating radio wavesin a free space upon performing wireless communication.

In an embodiment, the electronic device may include additionalcomponents. In an embodiment, various additional components may beconfigured depending on the type of the electronic device. For example,the additional components may include at least one of a power unit(e.g., battery), an input/output unit (I/O unit), a driving unit, and acomputing unit, but are not limited thereto.

Without limitations thereto, the electronic device may include a bus inan embodiment. In an embodiment, one or more system components (e.g., aprocessor, a memory, or a transceivers) may be interconnected by one ormore buses. In an embodiment, one or more buses may include a circuitrythat interconnects or controls communication between system components.

In an embodiment, the electronic device may be implemented as a robot,vehicle, XR device, mobile device, home appliance, IoT device, terminaldevice for digital broadcasting, hologram device, public safety device,MTC device, medical device, fintech device, security device,climate/environment device, AI server, base station, or network node,but is not limited thereto. In an embodiment, the electronic device maybe implemented as a projector device (e.g., a master projector device ora slave projector device), or a UE associated with the projector device,but is not limited thereto.

It should be appreciated that various embodiments of the presentdisclosure and the terms used therein are not intended to limit thetechnological features set forth herein to particular embodiments andinclude various changes, equivalents, or replacements for acorresponding embodiment. As used herein, the singular forms “a,” “an,”and “the” are intended to include the plural forms as well, unless thecontext clearly indicates otherwise. As used herein, the term ‘and/or’should be understood as encompassing any and all possible combinationsby one or more of the enumerated items. As used herein, the terms“include,” “have,” and “comprise” are used merely to designate thepresence of the feature, component, part, or a combination thereofdescribed herein, but use of the term does not exclude the likelihood ofpresence or adding one or more other features, components, parts, orcombinations thereof. As used herein, each of such phrases as “A or B,”“at least one of A and B,” “at least one of A or B,” “A, B, or C,” “atleast one of A, B, and C,” and “at least one of A, B, or C,” may includeall possible combinations of the items enumerated together in acorresponding one of the phrases. As used herein, such terms as “1st”and “2nd,” or “first” and “second” may be used to simply distinguish acorresponding component from another, and does not limit the componentsin other aspect (e.g., importance or order).

As used herein, the term “part” or “module” may include a unitimplemented in hardware, software, or firmware, or any combinationthereof, and may interchangeably be used with other terms, for example,“logic,” “logic block,” “part,” or “circuitry”. A part or module may bea single integral component, or a minimum unit or part thereof, adaptedto perform one or more functions. For example, according to anembodiment, ‘part’ or ‘module’ may be implemented in a form of anapplication-specific integrated circuit (ASIC).

As used in various embodiments of the disclosure, the term “if” may beinterpreted as “when,” “upon,” “in response to determining,” or “inresponse to detecting,” depending on the context. Similarly, “if A isdetermined” or “if A is detected” may be interpreted as “upondetermining A” or “in response to determining A”, or “upon detecting A”or “in response to detecting A”, depending on the context.

The program executed by the projector device MPJ or SPJ described hereinmay be implemented as a hardware component, a software component, and/ora combination thereof. The program may be executed by any system capableof executing computer readable instructions.

The software may include computer programs, codes, instructions, orcombinations of one or more thereof and may configure the processingdevice as it is operated as desired or may instruct the processingdevice independently or collectively. The software may be implemented asa computer program including instructions stored in computer-readablestorage media. The computer-readable storage media may include, e.g.,magnetic storage media (e.g., read-only memory (ROM), random-accessmemory (RAM), floppy disk, hard disk, etc.) and an optically readablemedia (e.g., CD-ROM or digital versatile disc (DVD). Further, thecomputer-readable storage media may be distributed to computer systemsconnected via a network, and computer-readable codes may be stored andexecuted in a distributed manner. The computer program may bedistributed (e.g., downloaded or uploaded) via an application store(e.g., Play Store™), directly between two UEs (e.g., smartphones), oronline. If distributed online, at least part of the computer programproduct may be temporarily generated or at least temporarily stored inthe machine-readable storage medium, such as memory of themanufacturer's server, a server of the application store, or a relayserver.

According to various embodiments, each component (e.g., a module or aprogram) of the above-described components may include a single entityor multiple entities. Some of the plurality of entities may beseparately disposed in different components. According to variousembodiments, one or more of the above-described components may beomitted, or one or more other components may be added. Alternatively oradditionally, a plurality of components (e.g., modules or programs) maybe integrated into a single component. In such a case, according tovarious embodiments, the integrated component may still perform one ormore functions of each of the plurality of components in the same orsimilar manner as they are performed by a corresponding one of theplurality of components before the integration. According to variousembodiments, operations performed by the module, the program, or anothercomponent may be carried out sequentially, in parallel, repeatedly, orheuristically, or one or more of the operations may be executed in adifferent order or omitted, or one or more other operations may beadded.

While the disclosure has been illustrated and described with referenceto various example embodiments, it will be understood that the variousexample embodiments are intended to be illustrative, not limiting. Itwill be further understood by those skilled in the art that variouschanges in form and detail may be made without departing from the truespirit and full scope of the disclosure, including the appended claimsand their equivalents. It will also be understood that any of theembodiment(s) described herein may be used in conjunction with any otherembodiment(s) described herein.

What is claimed is:
 1. A master projector device, comprising: a visiblelight sensor configured to detect a visible light wavelength band; aninvisible light sensor configured to detect an invisible lightwavelength band; at least one transceiver configured to communicate witha slave projector device; a memory including a program including atleast one instruction; and at least one processor electrically connectedwith the visible light sensor, the invisible light sensor, the at leastone transceiver, and the memory and configured to execute the at leastone instruction of the program, wherein the processor is configured to:obtain first sensing information obtained through the visible lightsensor, obtain second sensing information through the invisible lightsensor, generate a positional relationship with the slave projectordevice based on the first sensing information and the second sensinginformation, and control a projection direction and projection range ofthe slave projector device based on the generated positionalrelationship and the second sensing information identified by theinvisible light sensor while projecting an image stored in the memory toa projection surface.
 2. The master projector device of claim 1, furthercomprising a projector and an emitter, wherein the projector isconfigured to project a visible light band image to a first projectionarea, and the emitter is configured to emit an invisible band invisibleindicator to be included in the first projection area.
 3. The masterprojector device of claim 2, wherein the processor is configured to;project a visible indicator to the first projection area using theprojector and control the slave projector device to project a visibleindicator to the second projection area, generate first relationshipinformation based on positions of visible indicators identified by thevisible light sensor in the first projection area and the secondprojection area, and generate second relationship information byassociating a position of the invisible indicator identified by theinvisible light sensor to the first relationship information in at leastone of the first projection area or the second projection area, andwherein the second relationship information is configured as at least aportion of the positional relationship.
 4. The master projector deviceof claim 2, wherein a field of view of the projector is set to besmaller than a field of view of the visible light sensor.
 5. The masterprojector device of claim 2, wherein a field of view of the projector isset to be smaller than a field of view of the invisible light sensor. 6.The master projector device of claim 2, wherein the emitter isconfigured to emit light in a wavelength band of at least one ofultraviolet, near ultraviolet, infrared, and near infrared light.
 7. Themaster projector device of claim 2, wherein the first sensinginformation includes a coordinate value regarding a plurality of visibleindicators projected by the projector.
 8. The master projector device ofclaim 2, wherein the second sensing information includes a coordinatevalue regarding a plurality of invisible indicators projected by theemitter.
 9. The master projector device of claim 2, wherein theprocessor is configured to: identify an overlap area included in thefirst projection area using the visible light sensor; and change agrayscale in the overlap area in gradations.
 10. The master projectordevice of claim 2, wherein the processor is configured to: identify anoverlap area included in the first projection area using the visiblelight sensor; change a grayscale in a filling area including the overlaparea into a specified grayscale value, and change grayscales in at leasttwo areas adjacent to the overlap area in gradations outward.
 11. Amaster projector device, comprising: a projector configured to output avisible indicator and an image; an emitter configured to emit aninvisible indicator; a visible light sensor configured to identify thevisible indicator; an invisible light sensor configured to identify theinvisible indicator; at least one transceiver configured to communicatewith a slave projector device; a memory including a program including atleast one instruction; and at least one processor electrically connectedwith the projector, the emitter, the visible light sensor, the invisiblelight sensor, the at least one transceiver, and the memory andconfigured to execute the at least one instruction of the program,wherein the processor is configured to; identify the invisible indicatoremitted to at least a partial area of a projection surface correspondingto a second field of view through the invisible light sensor having thesecond field of view while projecting an image stored in the memory tothe projector having a first field of view, and control a projectiondirection and projection range of the slave projector device based on acoordinate value of the identified invisible indicators.
 12. The masterprojector device of claim 11, wherein the first field of view of theprojector is set to be smaller than a third field of view of the visiblelight sensor.
 13. The master projector device of claim 11, wherein thefirst field of view of the projector is set to be smaller than thesecond field of view of the invisible light sensor.
 14. The masterprojector device of claim 11, wherein the processor is configured to:project a visible indicator to the first projection area using theprojector and control the slave projector device to project a visibleindicator to the second projection area, generate first relationshipinformation based on positions of visible indicators identified by thevisible light sensor in the first projection area and the secondprojection area, and generate second relationship information byassociating a position of the invisible indicator identified by theinvisible light sensor to the first relationship information in at leastone of the first projection area or the second projection area, andwherein the second relationship information is configured as at least aportion of the positional relationship.
 15. The master projector deviceof claim 11, wherein the processor is configured to control the masterprojector to output only the invisible indicator, or the visibleindicator and the invisible indicator, while outputting the image.